That pattern is in the French Braid Quilts book by Jane Hardy Miller. It may also be in the French Braid Obsession (same author), but I can't dig it out tonight to check.
I am in the process of quilting one myself and it is so easy! I did the first of 4 panels in about 1 hour. I hope to post a picture of mine in the next several days.
As Maryb119 stated, it is fun, fast and beautiful! The hardest part is deciding on the fabrics! :)